PHP 數組按值和最小值-最大值分組

Question

我需要幫助合並 PHP 中的數組，我有這個數組，我正在嘗試按model分組項目並合並年份的最小值和最大值：

[0] => Array
    (
        [brand] => SUZUKI
        [model] => GSF 1250 Bandit
        [year] => 2006
    )

[1] => Array
    (
        [brand] => SUZUKI
        [model] => GSF 1250 Bandit
        [year] => 2007
    )

[2] => Array
    (
        [brand] => SUZUKI
        [model] => GSF 1250 Bandit
        [year] => 2008
    )


[3] => Array
    (
        [brand] => SUZUKI
        [model] => GSX 1250FA
        [year] => 2011
    )

[4] => Array
    (
        [brand] => SUZUKI
        [model] => GSX 1250FA
        [year] => 2012
    )

[5] => Array
    (
        [brand] => SUZUKI
        [model] => GSR 600
        [year] => 2006
    )

[6] => Array
    (
        [brand] => SUZUKI
        [model] => GSR 600
        [year] => 2007
    )

[7] => Array
    (
        [brand] => SUZUKI
        [model] => GSR 600
        [year] => 2008
    )

我想按model分組項目並合並year的最小值和最大值，如下所示：

[0] => Array
    (
        [brand] => SUZUKI
        [model] => GSF 1250 Bandit
        [year] => 2006 - 2008
    )

[1] => Array
    (
        [brand] => SUZUKI
        [model] => GSX 1250FA
        [year] => 2011 - 2012
    )

[2] => Array
    (
        [brand] => SUZUKI
        [model] => GSR 600
        [year] => 2006 -2008
    )

我知道如何按 model 對項目進行分組，但我無法實現合並年份：

foreach($array as $row){
    $newArray[$row["model"]] = array(
        "brand" => $row["brand"],
        "model" => $row["model"],
        "year" => $row["year"]
    );
}

感謝您的任何幫助。

Answer 1

這將其分為兩個階段，首先收集每個項目的最小和最大年份的數據。 設置最小值和最大值時，它會檢查先前的值（如果未找到則默認設置）並應用適當的min()或max() ...

$newArray = [];
foreach($array as $row){
    $newArray[$row["model"]] = array(
        "brand" => $row["brand"],
        "model" => $row["model"],
        "minyear" => min($newArray[$row["model"]]["minyear"] ?? PHP_INT_MAX, $row["year"]),
        "maxyear" => max($newArray[$row["model"]]["maxyear"] ?? PHP_INT_MIN, $row["year"]),
    );
}

這會產生...

Array
(
    [GSF 1250 Bandit] => Array
        (
            [brand] => SUZUKI
            [model] => GSF 1250 Bandit
            [minyear] => 2006
            [maxyear] => 2008
        )

    [GSX 1250FA] => Array
        (
            [brand] => SUZUKI
            [model] => GSX 1250FA
            [minyear] => 2011
            [maxyear] => 2012
        )

)

然后，您可以處理它以提供您所追求的格式的年份（刪除不再使用的字段）...

foreach ( $newArray as &$row )  {
    $row['year'] = $row['minyear'] . " - ". $row['maxyear'];
    unset ( $row['minyear'], $row['maxyear'] );
}

產生...

Array
(
    [GSF 1250 Bandit] => Array
        (
            [brand] => SUZUKI
            [model] => GSF 1250 Bandit
            [year] => 2006 - 2008
        )

    [GSX 1250FA] => Array
        (
            [brand] => SUZUKI
            [model] => GSX 1250FA
            [year] => 2011 - 2012
        )

)